1. people who time events or activities with a clock or stopwatch
2. drug dealers who work in shifts around the clock
Usage: slang

Examples

• The race officials assigned several clockers to time the runners.
• Professional clockers ensure accurate timing at track meets.
• The clockers recorded each swimmer’s lap time.
• Olympic events require multiple clockers for precision.
• Police arrested several clockers in the drug bust.
• The clockers operated in three shifts throughout the day.